Improvement in balanced valves for hydraulic cranes



J. A. VAUGHN Balanced Valves for Hydraulic Cranes,

No. 143,266, PatentedSeptember30,1873

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UNITED STATES PATENT OFFICE.

JAMES A. VAUGHN, OF OUYAHOGA FALLS, OHIO.

IMPROVEMENT IN BALANCED VALVES FOR HYDRAULIC CRANES.

Specification forming part of Letters Patent No. 143,266, dated September 30, 1873; application filed July 31, 1873.

To all whom it may concern Be it known that I, JAMES A. VAUGHN, of Ouyahoga Falls, Summit county, Ohio, have invented an Improvement in Balanced Valves for Hydraulic Cranes, &c., of which the following is a specification:

The invention relates to hydraulic cranes and other hydraulic engines operated by means of water at a high pressure; and the object of the invention is to afi'ord a perfectly balanced valve, simple in construction and easily operated, and which will enable the operator .to retain the water in the machine after the low cylinder fitted externally to the inside of the cylinder A, as shown, and perforated laterally with a series of orifices, as indicated by dotted lines, to permit the water to escape through it into the larger portion of the cylinder A at g, and thence discharge through the exhaust-port O. The cylinders A and D are turned internally of the same size at the points a a, a a, and b b, respectively, for the reception of pistons. Between the lower end of the cylinder D and a shoulder in the cylinder A is pressed'a rubber or leather ring, ff, and the cylinder D is held in place firmly by the cylinder-head F, which screws into the cylinder A. Inside of the cylinder A is a piston-rod, H, made water-tight at the head F by means of a stuffing-box, G, and furnished with a long solid piston, K, so turned as to fit the cylinder D at the point I), and make a water-tight joint by means of the leather or rubber ring f. Upon the rod H are two other pistons, formed by the disks L L L L and the spool M, which latter is held in place by means of a nut, P, and forming water-tight joints'with the inside of the cylinder A at the points a. a, respectively, by leather or rubber rings at d pressed into cup form, and held firmly by the disks L L and the flanges N N of the spool M. The duty of the piston L N d is to balance the corresponding piston L N 01, thus removing all resistance, except friction, to the working of the valve.

In the drawing, the pistons are represented in position to close the inlet-port and open the exhaust.

When it is desired to operate the crane, the piston-rod is forced downward until the piston K enters the ring f and closes the exhaustport 0, and until the piston N L d passes into the enlargement c c in the cylinder A, permitting the' water from the inlet-port B to pass around it into the crane through the port E. When desired, the pistons may be raised until the piston N L 01 again fits the cylinder A and closes the supply, but not enough to withdraw the piston K from the ring], thus holding the water in the crane until it is released by raising the pistons still higher to the position shown. The edges of the disks L L, flanges N N, and interior of the cylinder D, at the point b, are beveled from the leather rings, so as to render the effect'o'f the opening and closing of the valves gradual.

I claim as my invention- 1. The combination of the long piston K with the pistons L N d N L d and cylinder A, so arranged as to retain the water in the crane after the inlet-port shall have been closed.

2. The beveled edges of the disk L, flange N, and interior of the cylinder D, at b, for the purpose of rendering the efiect of opening and closing the valve gradual, and preventing the shock consequent upon a sudden opening.

JAMES A. VAUGHN.

Witnesses GEO. Dow, GEO. L. Dow. 

